Both coordinates are negative in this case.
They have negative values
No it is not true
Substitute the coordinates of the point into the equation of the line. If the result is true, then the point is on the line.
It is 100*(Calculated Value - True Value)/True Value
False
True
False
Some of them but not all. For example, uniqueness. The rectangular coordinates (x, y) represent a different point if either x or y is changed. This is also true for polar coordinate (r, a) but only if r > 0. For r = 0 the coordinates represent the same point, whatever a is. Thus (x, y) has a 1-to-1 mapping onto the plane but the polar coordinates don't.
False
Square root of x + y divided by 2
True
Both coordinates are negative in this case.
Yes, it is true.
Their first coordinates are positive and their second coordinates are negative.
True
Polar Bears have black skin. Belive it or not, it's true.